Assign oxidation number to the underlined elements in each of the following species. (i) \( \mat...

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Assign oxidation number to the underlined elements in each of the following species.
(i) \( \mathrm{NaH}_{2} \underline{\mathrm{PO}_{4}} \)
(ii) \( \mathrm{NaH}_{\underline{S}} \mathrm{O}_{4} \)
(iii) \( \mathrm{CaO}_{2} \)
(iv) \( \mathrm{Na}_{\underline{B}} \mathrm{H}_{4} \)
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